15w-50 M1 in a 4 banger

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I was just wondering about this my buddy has a Chevy s10 with a 2.2L ohv 4cly and he runs 15w-50 m1 ep that seems way to much for the engine considering it calls for 5w-30 and the owners manual say not to use anything thicker than a 10w-30 (such as a 20w-50)
 

crazycrak

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 Originally Posted By: Zaedock
The ironic thing, is that his vehicle will probably outlast ours.
yeah its got 250K on it I think he said he put it in it starting at 80K r so You would think the oil would be to thick to get between the piston and cly. wall causing wear unit the oil could get in there
 
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250K on a 2.2L GM four which isn't a paragon of refinement and efficiency? Heck, I'd use just about anything. M1 15-50 is more than good enough for that thing. He's probably taking better care of it than most people with nicer, more expensive trucks. Tell your buddy I salute him.
 
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^^I agree with bretfraz M1 15W50 is an excellent oil. It`s not as thick as most people seem to think. That engine will probably last forever on that oil.
 
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If it's acceptable to use that grade of oil in the climate he operates the vehicle in, I suppose he can.
 
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Isn't there a guy on here that says he uses M1 15w-50 in all his vehicles and has like over 200k miles on each of them?
 
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 Originally Posted By: aquariuscsm
^^I agree with bretfraz M1 15W50 is an excellent oil. It`s not as thick as most people seem to think. That engine will probably last forever on that oil.
Agreed.
 
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 Originally Posted By: CharlieJ
Isn't there a guy on here that says he uses M1 15w-50 in all his vehicles and has like over 200k miles on each of them?
\:\! That would be me. I put M1 15W-50 in my wife's Cavalier the day it came home from the dealer in December of 1998. It now has 209,XXX miles, is daily driven. I put M1 15W-50 in my 1986 Toyota with the 2.4L I4 engine at 40,000 miles. It now has 301,000 miles and is still in use, hard use. If we go back to 1990, when I started to use M1 15W-50, and nothing else, in every vehicle that me, my wife, my two daughter and their husbands have, or have had, we average 198,xxx miles per vehicle, with 3 of them over 200,000 and another that will likely go over 200,000 in the next month. There was in this group a 1.5l Kia, a 1.5L Mitsubishi, and a 1.8L Aveo. We have just over 2,000,000 miles since 1990, if you let me count the Toyota.
 
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15W-50 will work fine in his (and my) motor, but is not optimal... I personally wouldn't use anything heavier than 10W-30 in it since there is no need. If he really is intent on using syn, he'd be much better off running M1 10W-30 High Mileage in the summer, which almost surely is a PAO/Group IV based oil since it flows at -65F, yet is one of the thickest 10W-30s at operating temp... Mine seems to run just a touch quicker using 5W-30 over 10W-30 (MaxLife in both weights). It also did very well with Pennzoil Platinum 5W-30 in it...
 
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Feh! HTHS is only 4.5, and it will no doubt shear a few points with use. The bearings, pistons, rings, etc. will barely notice a <50% increase over typical (~3.0) 10w30. Zee Oil (GC) 0w30 is 3.7, Redline 10w30 = 3.8. No one cries "The End is Near" when people use those fine oils. Barring extreme cold weather, M1 15-50 won't hurt a thing. The stuff is designed for flat tappet applications, with significantly more Phos/Zinc and, AFAIK, Boron, than most other M1 mixes. I've got a small stash of EP, and add a Qt to the usual 10w30 my Accord runs. It also gets used as a mid-change top off, about 1/2 qt at 4K. It's a shame Mobil will be discontinuing the oil in May; I've set aside one of my $10 rebate forms in the hopes of snagging some at closeout prices. Having said all that, I've got to admit that I'd be a little shy of using it straight. I wouldn't lose too much sleep running 100%, but would prefer to throw in a Qt of 0W20 if filling my Honda. :)
 
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Would 15W-50 be used typically for diesel applications? I always see varying brands of diesel application 15W-40 for sale, and it makes me wonder if the oil would have any use in a normal gasoline car.
 
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the 2.2L runs forever with maintenance. it's not refined and the piston slap you have to get used to. I got 162k on my 2.2 OHV and I just topped off with 15w-40 mobil delvac SL
 
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